Smelting process and apparatus

a technology of smelting process and smelting apparatus, which is applied in the direction of lighting and heating apparatus, charging manipulation, furniture, etc., to achieve the effect of rapid carbon boil and rapid foaming

Active Publication Date: 2020-03-10
TATA STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention seeks to prevent foaming events in a smelting chamber of a smelting vessel of an HIsarna smelting apparatus caused by solid accretions breaking off from an off-gas duct and falling into the molten bath. The invention includes an inlet section with a bend that moves off-gas quickly away from the apparatus, allowing liquid material to de-entrain in a high temperature section of the off-gas duct and run back continuously into the smelting chamber. This results in the accretions formed on walls of the off-gas duct melting and falling into the molten bath, reducing the amount of carbon dioxide released during the smelting process.

Problems solved by technology

The applicant believes that these more or less regular falling solid lumps cause undesirable “mini carbon boil” events, each one increasing the CO released from the molten bath for a short time period.

Method used

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  • Smelting process and apparatus
  • Smelting process and apparatus

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Embodiment Construction

[0044]The process and the apparatus shown in FIG. 1 is an embodiment of the HIsarna process and apparatus.

[0045]The process and the apparatus of the invention are not confined to HIsarna process and apparatus and also extend to any other molten bath-based smelting process and apparatus.

[0046]The process and the apparatus shown in FIG. 1 are used on the use of an apparatus that includes a smelt cyclone 2 and a molten bath-based smelting vessel 4 located directly beneath the smelt cyclone 2, with direct communication between the chambers of the smelt cyclone 2 and the smelting vessel 4.

[0047]With reference to FIG. 1, a blend of metalliferous feed material in the form of magnetite-based ore (or other iron ore) with a top size of 6 Mitt and limestone is fed, via an ore dryer, into the smelt cyclone 2 using a pneumatic conveying gas 1a. Limestone represents roughly 8-10 wt % of the combined stream of ore and limestone. Coal 3 is fed, via a separate dryer, to the smelting vessel 4 where i...

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Abstract

A smelting apparatus that includes (a) a smelting vessel (4) that is adapted to contain a bath of molten metal and slag and (b) a smelt cyclone (2) for pre-treating a metalliferous feed material positioned above and communicating directly with the smelting vessel The apparatus also includes an oft-gas duct (9) extending from the smelt, cyclone for discharging an off-gas from the smelt cyclone. The off-gas duct has an inlet section (18) that extends upwardly from the smelt cyclone and is formed to cause off-gas to undergo a substantial change of direction as it flows through the inlet section of the off-gas duct.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a U.S. National Phase filing of International Application No. PCT / AU 2014 / 001146, filed on Dec. 19, 2014, designating the United States of America and claiming priority to Australian Patent Application No. 2013904992 filed Dec. 20, 2013. The present application claims priority to and the benefit of all the above-identified applications, which are all incorporated by reference herein in their entireties.TECHNICAL FIELD[0002]The present invention relates to a process and an apparatus for smelting a metalliferous material.[0003]In particular, although by no means exclusively, the present invention relates to a smelting process and apparatus fir smelting an iron-containing material, such as an iron ore, and producing iron.BACKGROUND[0004]A known molten bath-based smelting process is referred to hereinafter as the “HIsarna” process.[0005]The term “smelting” is herein understood to mean thermal processing wherein chem...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): C21B13/14F27D17/00C21B13/00C22B34/12F27D3/18F27D3/15F27B1/10C21C5/56F27D3/16
CPCF27D17/001F27D17/008C22B34/1295C21B13/0026C22B34/1263C21B13/143F27D3/18F27D3/1545C21C5/567C21B13/004F27B1/10F27D3/1509F27D2003/168F27D2003/164Y02P10/136Y02P10/134
InventorDRY, RODNEY JAMESPILOTE, JACQUESMEIJER, HENDRIKUS KOENRAAD ALBERTUS
OwnerTATA STEEL